I somewhat agree with this. However, I would never say that it is not a priority for a defensive lineman, regardless of position, to have issues with disengaging from blocks. If you cannot disengage from blocks consistently, even as a nose tackle, you will tend to get pushed out of the zone of influence you are trying to occupy. You also do prefer if you have a NT with a good burst, who can get past a blocker, and occasionally put some pressure on the QB right up the gut. Not his primary responsibility for sure, but to say that an inability to disengage from blocks is not a big deal for a NT is a bit of an over statement I think.